The only obvious difference is the cable itself – or the lack of it. Buying a cordless device usually comes with an extra charge for the battery, although this can sometimes be interchangeable with other devices of the same brand. Corded devices are easier to carry around and can become tripping or tripping hazards, while cordless devices are smaller and weigh less due to the need for a battery.
Wireless devices may be a better alternative, but batteries can drain. Meaning that wireless devices can be used for a long time before you have to put them aside to recharge, or swap out for a replacement battery. In contrast, corded devices are safe because they are plugged directly into the same power source – so they will work until the job is finished or the device is damaged. Although it won’t do you much good in a blackout, or during a power outage.
Actual power is also important when comparing wired and wireless devices, as wireless devices are limited by battery voltage (anywhere from 12V to 54V). These values also vary depending on the type of device being used, but in reality you will not come across a cordless device that can exceed 54V. Corded appliances, on the other hand, can reach between 110V and 240V (depending on location), and more voltage means more power.